diff options
Diffstat (limited to 'drivers/media/video/videobuf2-vmalloc.c')
| -rw-r--r-- | drivers/media/video/videobuf2-vmalloc.c | 70 |
1 files changed, 47 insertions, 23 deletions
diff --git a/drivers/media/video/videobuf2-vmalloc.c b/drivers/media/video/videobuf2-vmalloc.c index 4e789a178f8..6b5ca6c70a4 100644 --- a/drivers/media/video/videobuf2-vmalloc.c +++ b/drivers/media/video/videobuf2-vmalloc.c @@ -10,6 +10,7 @@ * the Free Software Foundation. */ +#include <linux/io.h> #include <linux/module.h> #include <linux/mm.h> #include <linux/sched.h> @@ -22,6 +23,7 @@ struct vb2_vmalloc_buf { void *vaddr; struct page **pages; + struct vm_area_struct *vma; int write; unsigned long size; unsigned int n_pages; @@ -71,6 +73,8 @@ static void *vb2_vmalloc_get_userptr(void *alloc_ctx, unsigned long vaddr, struct vb2_vmalloc_buf *buf; unsigned long first, last; int n_pages, offset; + struct vm_area_struct *vma; + dma_addr_t physp; buf = kzalloc(sizeof(*buf), GFP_KERNEL); if (!buf) @@ -80,23 +84,37 @@ static void *vb2_vmalloc_get_userptr(void *alloc_ctx, unsigned long vaddr, offset = vaddr & ~PAGE_MASK; buf->size = size; - first = vaddr >> PAGE_SHIFT; - last = (vaddr + size - 1) >> PAGE_SHIFT; - buf->n_pages = last - first + 1; - buf->pages = kzalloc(buf->n_pages * sizeof(struct page *), GFP_KERNEL); - if (!buf->pages) - goto fail_pages_array_alloc; - /* current->mm->mmap_sem is taken by videobuf2 core */ - n_pages = get_user_pages(current, current->mm, vaddr & PAGE_MASK, - buf->n_pages, write, 1, /* force */ - buf->pages, NULL); - if (n_pages != buf->n_pages) - goto fail_get_user_pages; - - buf->vaddr = vm_map_ram(buf->pages, buf->n_pages, -1, PAGE_KERNEL); - if (!buf->vaddr) - goto fail_get_user_pages; + vma = find_vma(current->mm, vaddr); + if (vma && (vma->vm_flags & VM_PFNMAP) && (vma->vm_pgoff)) { + if (vb2_get_contig_userptr(vaddr, size, &vma, &physp)) + goto fail_pages_array_alloc; + buf->vma = vma; + buf->vaddr = ioremap_nocache(physp, size); + if (!buf->vaddr) + goto fail_pages_array_alloc; + } else { + first = vaddr >> PAGE_SHIFT; + last = (vaddr + size - 1) >> PAGE_SHIFT; + buf->n_pages = last - first + 1; + buf->pages = kzalloc(buf->n_pages * sizeof(struct page *), + GFP_KERNEL); + if (!buf->pages) + goto fail_pages_array_alloc; + + /* current->mm->mmap_sem is taken by videobuf2 core */ + n_pages = get_user_pages(current, current->mm, + vaddr & PAGE_MASK, buf->n_pages, + write, 1, /* force */ + buf->pages, NULL); + if (n_pages != buf->n_pages) + goto fail_get_user_pages; + + buf->vaddr = vm_map_ram(buf->pages, buf->n_pages, -1, + PAGE_KERNEL); + if (!buf->vaddr) + goto fail_get_user_pages; + } buf->vaddr += offset; return buf; @@ -120,14 +138,20 @@ static void vb2_vmalloc_put_userptr(void *buf_priv) unsigned long vaddr = (unsigned long)buf->vaddr & PAGE_MASK; unsigned int i; - if (vaddr) - vm_unmap_ram((void *)vaddr, buf->n_pages); - for (i = 0; i < buf->n_pages; ++i) { - if (buf->write) - set_page_dirty_lock(buf->pages[i]); - put_page(buf->pages[i]); + if (buf->pages) { + if (vaddr) + vm_unmap_ram((void *)vaddr, buf->n_pages); + for (i = 0; i < buf->n_pages; ++i) { + if (buf->write) + set_page_dirty_lock(buf->pages[i]); + put_page(buf->pages[i]); + } + kfree(buf->pages); + } else { + if (buf->vma) + vb2_put_vma(buf->vma); + iounmap(buf->vaddr); } - kfree(buf->pages); kfree(buf); } |